[Wrf-users] mpich2 and/or openmpi?

[Dmitry N. Mikushin]

Dear Martin,

MPICH2 and OpenMPI are both implementations of MPI standard, i.e. indeed
they provide the same functionality, and to run WRF you will need only one
of them. Also both of them do provide mpirun. And yes, multiple versions of
MPI may co-exist on the same system, but only one of them could be
currently active (because their parts may intersect and mix badly). You can
activate or deactivate MPI implementation with different tools, for
example, mpi-selector.

Hope it helps,
- Dima.

2012/4/26 Martin Ivanov <martin.ivanov at ifg.uni-tuebingen.de>

> Dear WRF users,
>
> I am about to install the WRF-3.4 model on my computer. According to the
> documentation
> mpich2 and/or openmpi can be installed to enhance functionality. As I am
> not a expert in the field of numerical computing,
> please apologise the probably stupid question I am going to ask.
> Should I install both mpich2 and openmpi on my system or just one of
> them? According to their descriptions, they implement the same
> functionality, but the examples in the WRF user's guide are with mpirun,
> i.e assuming mpich2. Can these two libraries actully coexist on a
> system, does this make sense? If they cannot, which one would you
> recommend? My system is Slackware64-13.37 kernel 2.6.38.4.
>
>
> Best regards,
>
> --
> Dr. Martin Ivanov
> Eberhard-Karls-Universität Tübingen
> Mathematisch-Naturwissenschaftliche Fakultät
> Fachbereich Geowissenschaften
> Water&  Earth System Science (WESS)
> Keplerstraße 17, 72074 Tübingen, Deutschland
> Tel. +4970712975023
>
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